Migrating from JSON to EDN

[Jonathon McKitrick]

I have a basic SPA app using JSON for client/server communication. I'm considering switching to EDN.

* Is there any reason I should consider staying with JSON, assuming this API will not be consumed elsewhere?

* How complex is the changeover on both client and server sides?

* Are there any other caveats I might want to consider?

[Brandon Adams]

Last time I checked, EDN was slower than JSON browser-side. I don't have any numbers on that, but it never affected the SPA I wrote and used EDN with. It was nice being able to send tagged values and sets, which are both things json doesn't have. 

Have you looked into Transit? It seems to offer a lot of the benefits of EDN without taking much of a performance hit. It's also a little more portable across other languages (although you said this doesn't matter right now).

As far as switching, it's probably just middleware that needs swapping out and your mimetype that needs to change in cljs-http or cljs-ajax. EDN works as a superset of JSON using most of the common ring middleware. If you want to begin taking advantage of EDN features, you won't have to worry about how to map various record types or custom types into JSON anymore (although you obviously have to have a tagged reader implementation registered in the browser to do something with them). 

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[Linus Ericsson]

Transit is noticeably faster than EDN. I cannot recommend to use JSON
between a clojure backend and a clojurescript application, it's just
simply too much work to get everything right, entering dates, big
decimals, UUIDs...

/Linus

[jmcki...@gmail.com]

Actually, then, maybe I should check out transit, and modify my questions accordingly.  Would the switch to Transit be similar to the switch to EDN?

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Jonathon McKitrick

[Raymond Huang]

Right, one more thing I've noticed is that you might see quirks with the cljs.reader. Some character literal types are not supported, ie octal (though fairly trivial to patch) and some slight differences such as char literals converted to strings.